That's what it should do. I shutdown the Node Manager, Admin server, and the managed
server. After a few days, when I restart the Node Manger, it complained that "Cannot
detect the restartability of the managed server." Of cause it didn't restart the
killed managed server either.

I could not find out what's wrong. After I reinstalled WebLogic and reconfigured
the Node Manager, it started to work again. Unfortunately, the same problem happens
again with my second installation.